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[0/7] PCI: Solve two bridge window sizing issues

Message ID 20231222122901.49538-1-ilpo.jarvinen@linux.intel.com
Headers
Series PCI: Solve two bridge window sizing issues |

Message

Ilpo Järvinen Dec. 22, 2023, 12:28 p.m. UTC 
  Hi all,

Here's a series that contains two fixes to PCI bridge window sizing
algorithm. Together, they should enable remove & rescan cycle to work
for a PCI bus that has PCI devices with optional resources and/or
disparity in BAR sizes.

For the second fix, I chose to expose find_empty_resource_slot() from
kernel/resource.c because it should increase accuracy of the cannot-fit
decision (currently that function is called find_resource()). In order
to do that sensibly, a few improvements seemed in order to make its
interface and name of the function sane before exposing it. Thus, the
few extra patches on resource side.

Unfortunately I don't have a reason to suspect these would help with
the issues related to the currently ongoing resource regression
thread [1].

[1] https://lore.kernel.org/linux-pci/ZXpaNCLiDM+Kv38H@marvin.atrad.com.au/

Ilpo Järvinen (7):
  PCI: Fix resource double counting on remove & rescan
  resource: Rename find_resource() to find_empty_resource_slot()
  resource: Document find_empty_resource_slot() and resource_constraint
  resource: Use typedef for alignf callback
  resource: Handle simple alignment inside __find_empty_resource_slot()
  resource: Export find_empty_resource_slot()
  PCI: Relax bridge window tail sizing rules

 drivers/pci/bus.c       | 10 +----
 drivers/pci/setup-bus.c | 81 ++++++++++++++++++++++++++++++++++++++---
 include/linux/ioport.h  | 44 ++++++++++++++++++++--
 include/linux/pci.h     |  5 +--
 kernel/resource.c       | 69 ++++++++++++++++-------------------
 5 files changed, 150 insertions(+), 59 deletions(-)